Finished and submit Calculator project for review

Dania.Calculator/Calculator/Calculator.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CalculatorLibrary\CalculatorLibrary.csproj" />
+  </ItemGroup>
+
+</Project>

Dania.Calculator/Calculator/Calculator.slnx

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+<Solution>
+  <Project Path="../CalculatorLibrary/CalculatorLibrary.csproj" Id="8c230c77-dcfa-4d52-bfb3-d0d4ac6e72fc" />
+  <Project Path="Calculator.csproj" />
+</Solution>

Dania.Calculator/Calculator/Helpers.cs

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+public class Helpers
+{
+    static int numberOfCalculations = 0;
+
+    public static double CheckInputIsDouble()
+    {
+        string? numInput = Console.ReadLine();
+        double cleanNum = 0;
+
+        while (!double.TryParse(numInput, out cleanNum))
+        {
+            Console.WriteLine("This is not a valid input. Please enter a numeric value: ");
+            numInput = Console.ReadLine();
+        }
+
+        return cleanNum;
+    }
+
+    public static void CheckResultIsNaN(double result)
+    {
+        try
+        {
+            if (double.IsNaN(result))
+            {
+                Console.WriteLine("This operation will result in a mathematical error.\n");
+            }
+            else Console.WriteLine("Your result: {0:0.##}\n", result);
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine("Oh no! An exception occurred trying to do the math.\n - Details: " + e.Message);
+        }
+    }
+
+    public static void IncreaseNumberOfCalculations()
+    {
+        numberOfCalculations++;
+    }
+
+    public static int GetNumberOfCalculations()
+    { 
+        return numberOfCalculations;
+    }
+}

Dania.Calculator/Calculator/Program.cs

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+using System.Text.RegularExpressions;
+using CalculatorLibrary;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        bool isEndApp = false;
+
+        Calculator calculator = new Calculator();
+        while (!isEndApp)
+        {
+            double num1 = 0;
+            double num2 = 0;
+            double result = 0;
+
+            Console.Clear();
+            Console.WriteLine($"Number of Calculations this session: {Helpers.GetNumberOfCalculations()}");
+            Console.WriteLine("Choose an option from the following list:");
+            Console.WriteLine("\tA - Add");
+            Console.WriteLine("\tS - Subtract");
+            Console.WriteLine("\tM - Multiply");
+            Console.WriteLine("\tD - Divide");
+            Console.WriteLine("\tSQ - Square Root");
+            Console.WriteLine("\tP - Power");
+            Console.WriteLine("\tTE - 10x");
+            Console.WriteLine("\tT - Trigonometry");
+            Console.Write("Your option: ");
+
+            string? op = Console.ReadLine();
+            if (op != null) op = op.ToLower().Trim();
+
+            if (Regex.IsMatch(op, "[a|s|m|d]") &&  op != "sq")
+            {
+                Console.WriteLine("Type a number, and then press Enter: ");
+                num1 = Helpers.CheckInputIsDouble();
+
+                Console.WriteLine("Type another number, and then press Enter: ");
+                num2 = Helpers.CheckInputIsDouble();
+
+                result = calculator.DoOperation(num1, num2, op);
+                Helpers.CheckResultIsNaN(result);
+
+                Helpers.IncreaseNumberOfCalculations();
+            }
+            else if (Regex.IsMatch(op, "[p]"))
+            {
+                Console.WriteLine("Type the base number, and then press Enter: ");
+                num1 = Helpers.CheckInputIsDouble();
+
+                Console.WriteLine("Type the power number, and then press Enter: ");
+                num2 = Helpers.CheckInputIsDouble();
+
+                result = calculator.DoPower(num1, num2);
+                Helpers.CheckResultIsNaN(result);
+
+                Helpers.IncreaseNumberOfCalculations();
+            }
+            else if (Regex.IsMatch(op, "[sq|te]") && (op == "sq" || op == "te"))
+            {
+                Console.WriteLine("Type a number, and then press Enter: ");
+                num1 = Helpers.CheckInputIsDouble();
+
+                switch (op)
+                {
+                    case "sq":
+                        result = calculator.DoSquareRoot(num1);
+                        break;
+                    case "te":
+                        result = calculator.DoTenExponent(num1);
+                        break;
+                }
+                Helpers.CheckResultIsNaN(result);
+
+                Helpers.IncreaseNumberOfCalculations();
+            }
+            else if (Regex.IsMatch(op, "[t]"))
+            {
+                Console.WriteLine("Choose an option from the list: ");
+                Console.WriteLine("\tS - sin");
+                Console.WriteLine("\tC - cos");
+                Console.WriteLine("\tT - tan");
+                Console.Write("Your option: ");
+
+                do
+                {
+                    op = Console.ReadLine();
+                    if (op != null) op = op.ToLower().Trim();
+
+                    if (!Regex.IsMatch(op, "[s|c|t]"))
+                        Console.WriteLine("Error: Unrecognized input.");
+
+                } while (!Regex.IsMatch(op, "[s|c|t]"));
+
+                Console.WriteLine("Type a radian, and then press Enter: ");
+                num1 = Helpers.CheckInputIsDouble();
+
+                result = calculator.DoTrigonometry(num1, op);
+                Helpers.CheckResultIsNaN(result);
+
+                Helpers.IncreaseNumberOfCalculations();
+            }
+            else
+            {
+                Console.WriteLine("Error: Unrecognized input.");
+            }
+            Console.WriteLine("------------------------\n");
+
+            Console.Write("Press 'n' and Enter to close the app, or press any other key and Enter to continue: ");
+            if (Console.ReadLine() == "n") isEndApp = true;
+
+            Console.WriteLine("\n");
+        }
+
+        calculator.Finish();
+        return;
+    }
+}

Dania.Calculator/CalculatorLibrary/CalculatorLibrary.cs

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+using Newtonsoft.Json;
+
+namespace CalculatorLibrary
+{
+    public class Calculator
+    {
+        JsonWriter writer;
+
+        public Calculator() 
+        {
+            StreamWriter logfile = File.CreateText("calculator.json");
+            logfile.AutoFlush = true;
+            writer = new JsonTextWriter(logfile);
+            writer.Formatting = Formatting.Indented;
+            writer.WriteStartObject();
+            writer.WritePropertyName("Operations");
+            writer.WriteStartArray();
+        }
+
+        public double DoOperation(double num1, double num2, string op)
+        {
+            writer.WriteStartObject();
+            writer.WritePropertyName("Operand1");
+            writer.WriteValue(num1);
+            writer.WritePropertyName("Operand2");
+            writer.WriteValue(num2);
+            writer.WritePropertyName("Operation");
+
+            double result = double.NaN;
+
+            switch (op)
+            {
+                case "a":
+                    result = num1 + num2;
+                    writer.WriteValue("Add");
+                    break;
+                case "s":
+                    result = num1 - num2;
+                    writer.WriteValue("Subtract");
+                    break;
+                case "m":
+                    result = num1 * num2;
+                    writer.WriteValue("Multiply");
+                    break;
+                case "d":
+                    if (num2 != 0)
+                    {
+                        result = num1 / num2;
+                    }
+                    writer.WriteValue("Divide");
+                    break;
+                default:
+                    break;
+            }
+
+            writer.WritePropertyName("Result");
+            writer.WriteValue(result);
+            writer.WriteEndObject();
+
+            return result;
+        }
+
+        public double DoSquareRoot(double num)
+        {
+            writer.WriteStartObject();
+            writer.WritePropertyName("Operand");
+            writer.WriteValue(num);
+            writer.WritePropertyName("Operation");
+            writer.WriteValue("Square Root");
+
+            double result = Math.Sqrt(num);
+
+            writer.WritePropertyName("Result");
+            writer.WriteValue(result);
+            writer.WriteEndObject();
+
+            return result;
+        }
+
+        public double DoPower(double based, double power)
+        {
+            writer.WriteStartObject();
+            writer.WritePropertyName("Base");
+            writer.WriteValue(based);
+            writer.WritePropertyName("Exponent");
+            writer.WriteValue(power);
+            writer.WritePropertyName("Operation");
+            writer.WriteValue("Power");
+
+            double result = Math.Pow(based,power);
+
+            writer.WritePropertyName("Result");
+            writer.WriteValue(result);
+            writer.WriteEndObject();
+
+            return result;
+        }
+
+        public double DoTenExponent(double exponent)
+        {
+            writer.WriteStartObject();
+            writer.WritePropertyName("Exponent");
+            writer.WriteValue(exponent);
+            writer.WritePropertyName("Operation");
+            writer.WriteValue("Ten Exponent");
+
+            double result = Math.Pow(10, exponent);
+
+            writer.WritePropertyName("Result");
+            writer.WriteValue(result);
+            writer.WriteEndObject();
+
+            return result;
+        }
+
+        public double DoTrigonometry(double num, string op)
+        {
+            writer.WriteStartObject();
+            writer.WritePropertyName("Operand");
+            writer.WriteValue(num);
+            writer.WritePropertyName("Operation");
+
+            double result = double.NaN;
+
+            switch (op)
+            {
+                case "s":
+                    writer.WriteValue("Sin");
+                    result = Math.Sin(num);
+                    break;
+                case "c":
+                    writer.WriteValue("Cos");
+                    result = Math.Cos(num);
+                    break;
+                case "t":
+                    writer.WriteValue("Tan");
+                    result = Math.Tan(num);
+                    break;
+            }
+
+            writer.WritePropertyName("Result");
+            writer.WriteValue(result);
+            writer.WriteEndObject();
+
+            return result;
+        }
+
+        public void Finish()
+        { 
+            writer.WriteEndArray();
+            writer.WriteEndObject();
+            writer.Close();
+        }
+    }
+
+}

Dania.Calculator/CalculatorLibrary/CalculatorLibrary.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+  </ItemGroup>
+
+</Project>